The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: Octane Rating (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by scouncil on January 07, 2001 at 21:10:10:

In Reply to: Octane Rating posted by Ghassan Shaheeb on January 07, 2001 at 20:01:28:

My 95 525i will ping violently with anything less than 92 octane. I have tried running regular and mid-grade with no luck.

I thought that this engine had a knock sensor ignition system? Am I mistaken?

Scott

95 525i
85 318i
96 Jeep Gr Cherokee


Hi,
Does anyone know why BMW insists on uning high octane grade fuel (to be precise 91 Octane) when in fact engines like the ones on E34 535i and 525i employ a compression ration of 9.5:1?

Isn't it 87 or 89 octane should be sufficient for this compression ratio?

Please explain me this mystery.

1990 535iM.
Thank you.




Follow Ups:


[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2009 Jump Internet Inc. All rights reserved.